Process for the manufacture of a paper.



JULES GERNAERT, OF BRUSSELS, BELGIUM.

PROCESS FOR THE MANUFACTURE OF A PAPER.

No'Drawing.

To all whom it may concern Be it known that I, JULns GERNAERT, residing at 11 Rue de Lausanne, Brussels, in the Kingdom of Belgium, and a subject of the King of the Belgians, have invented certain new and useful Improvements in Processes for the Manufacture of .a Paper That Cannot be Imitated, hereinafter called security paper, and which is formed by means of inner plies. rolledon bobbins and which bear configurations recurring at fixed intervals and may be perforated or printed or composed of prints and perforations, the inner plies being introduced. between two outer paper plies rolled on bobbins.

The main characteristics of this process are: 1

1st. The materials used as inner plies are in all cases shrinkable and their degree of shrinkage varies according to their nature and thickness, also to the nature and thickness of the outer plies, to the nature and degree of fluidity of the gluing ma terial, to the temperature at which the insertion takes place and to the subsequent pressure. Moreover, the configurations may be placed on one or on both of the two faces of the so-called security paper, and the configurations coinciding exactly with each other so that they produce the effect of a single sharp picture when held against the li ht. fznd. The plies which form the security paper, after having been placed the one above the other, are united by means of gluing materials, which, after having dried, are practically insoluble.

3rd. The outside printed three-ply paper is finally subjected to the action of graining rollers, engine-turning rollers or other similar devices, in order to increase their adhesion.

Between two or more plies of paper, each rolled up on a bobbin in a pasting machine, is inserted a sheet of a material that has a different degree of shrinkage, depending on certain manufacturing conditions, and bearing a configuration which recurs at fixed intervals, such configuration consisting preferably of printed or perforated designs or both together.

The three-plies are united with each other by means of pasting material, which is insoluble in the usual dissolving media, after having once dried. When the three plies have been thus fastened. together, forming Patented Jan. 2, 191* one paper, this paper is printed on one or on both sides with designs or patterns which coincide exactly as to form and position with the configuration of the inner ply, thus producing the effect of a single sharply defined design when held up against the light. The printed paper is finally submitted to the action of graining rollers, engine-turning rollers or similar devices, in order to still further increase the adhesion of the plies. The finished article will then show a regularly: repeated or re-occurring pattern similar to what is the case with a wall paper.

The great advantage of the use of a shrinkable material, for the inner ply, consists in this, that a counterfeiter even if he were successful in copying the patterns of the inner plies, which is practically impos sible, he could not produce documents which would have the same size configurations as the genuine ones because he would have measured an inner ply which had already shrunk and the degree of contraction 'of which he did'not know.

Another advantage is that the printing blocks from which the counterfeiter would print the outer plies and the measurements for which he had been obliged to take from a finished document, will not coincide mathematically exactly with the inner patterns. Counterfeit documents will therefore be easily detected at first sight, from the genuine ones.

The use of a pasting material, which will be insoluble as soon as dry, has for its object to prevent the different plies composing the security paper from being separated from each other by any of the usual dissolving media.

I claim 1. The process of manufacturing threeply security paper which consists in combining with two outer plies, an intermediate ply having a pattern and a different coefficient of shrinkage relative to said outer plies; the outer plies after being combined, being printed with patterns exactly coinciding with that of the intermediate ply.

2. The process of manufacturing threeply security paper, which consists in inserting under pressure an intermediate ply of paper together with suitable adhesive be tween two outer plies, said intermediate ply being previously provided with a regularly repeated configuration and having a difl'erent coefficient of shrinkage to the outer Copies of this patent may be obtained for plies; in subsequently, upon the article having been dried, providing the outside of the three-ply paper With additional configuration exactly coinciding With the intermediate configuration. v

3. The process of manufacturing threeply security paper, Which consists in inserting under pressure an intermediate ply of paper together With suitable adhesive between tWo outer'plies," said intermediate ply being previously provided with a regularly repeated configuration and having a different coeflicient of shrinkage to the outer plies; in subsequently, upon the article havingbeen dried, providing the outside of the three-ply paper With additional configuration exactly coinciding With the interme diate configuration; and in finally subjecting the three-ply paper to additional pressure between knurled pressing members,

4. As an article of manufacture, a security paper, comprising a plurality of paper plies pasted together and having different coefficients of shrinkage, a configurafive cents each, by addressing the Washington, D. G. V 1

tion on the pasted side of one of said plies and a duplication of said configuration on the outside of another of said plies; saidconfigurations coinciding exactly With each other so as to glve the appearance of a single configuration.

5.- As an 211171016 of manufacture, asecurity paper, comprising a plurality'of paper plies pasted together and having diflerent coefficients of shrinkage,sa configuration on thepastedside of one ofrsaid plies and a duplication of said configuration on the outside of another of said plies; said configurations coinciding exactly With each other so as to give the appearance of a slngle configuration; the surface of the security paper being grooved. I V

The foregoing specification signed at Brussels'this thirty-first dayIof July, .1913. ,J'ULEs GERNAERT; I In presence of r F. JOSEPH LABARRYQ CHARLES JOHNSON.

Commissioner of Patents. 

